Insulator clamp



c. E. ROGERS IN/SULATOR CLAMP Filed'Sept. 4

March 9 1926.

620-22 5 22 Zoyaz;

Patented Mar. 9, 1926.

UNITED STATES GURTIS E. ROGERS, .OF LOGAN, WEST VIRGINIA.

A p cat n filed Se mbe 19 S ri NO- 54,540.

J '0 all whom may concern:

Be itv known that I, C RTIs E. ROGERS, a citizen of the United States, residing. at Logan, in the county of Logan and State of 5 West Yirgini-a,have invented certa n new and useful Improvements in Insulator vClamps, of which the following is a spec fie lh This invention relates to electrical conductors andparticularly to a support ng device for trolley wires.

In some locations, notably in mineshaving electrical traction, it is necessaryto operate at low voltage and in order to avoid undue voltage drops it is necessary touSe heavy feeder lines which are connected With the trolley line at. short intervals. For inanyreasonsit has been found desirable to arrange the feeder line above and parallel with the trolley line and to support both lines by the same insulator. In this way the construction cost is reduced and the feeder line is brought into closest conducting relah n W h the trolley ine at a h e mmeh point of support. Structures of this general type have heretofore been dev sed and us d, but e fa as I am dhe on .e them fully meets the requirements of the service.

1 Generally stated, these requirements are: The device must be of simple, rugged construction and applicable to existing types of insulator. The feeder clamp must be ca-v pable of accepting cables of diiferent sizes without requiring the use offillers or bushings. It should be possible to unclamp the trolley wire without releasing the feeder and it is desirable to be able to release the feeder without completely dismounting the clamp from the trolley wire. These various requirements are adequately met by my 111- vention, the preferred embodiment of which is illustrated in the accompanying drawings. In the drawings,

Fig. 1 is a fragmentary section of the top of a mine working, showing my device in side elevation attached to a standard type of insulator; I

Fig. 2 is a similar view looking from the right relatively to Fig. 1; r

Fig. 3 is a perspective viewof the elements of the feeder clamp;

Fig. 1 is a sectional view on a slightly enlarged scale on the line l-4 of Fig. 5; 1

is supported by means of an insulator con} is e" o g vani ed eas ir $119.1 11 whic ns a r h eel'in lehihginse t 12- he h 'l hreaded M t an or inary xpansion be h eted'ge ejr ally by the reference numeral 14. i This is sustained in h u al m nne i h l -dr lled er the ph pe n he e f f he m or n The insulating insert 12 sustains fixed thereon a threaded'stud 15. The parts so fardescribed are all familiar in the art, being standard articles of commerce.

Threaded on the stud 1 5 is the upper clamping member of myfeeder clamp. This includes a flange-likedisc 16 to center a union nut 17.21.1111 a lug 18 which serves as n o he ab e clamping member I W be observed that themember 18 is formed with a groove 19 to center the cable and that it projects beyond the disc 16, forming shoulders 20 upon which the nut 17 seats. The companion clamping member con sists of a body 21 of generally cylindrical form, formed with a central slot or'channel .22 to receive the feeder cable.

21 is threadedat23to receive the nut 17. The feeder cable, which is indicated at 24c, lies in the slot'22 and is clamped by the lng 18 which is drawn downwardinto the slot by t e; nut 17.. he nut 17 as stated, is in e gag ne itn ththe shei d' r 20 The member 21 is formed with a project he threaded Pe ti n 1 e i d am indicated at 25. On this is threaded a trolley clamp of any suitable form. I have chosen for illustration a commercial clamp shown in the patent to Chandler, No. 1,461,761, but any equivalent clamp might be substituted. This clamp consists of a base member 26 threaded on the portion 25 and carrying two cable clamping jaws 27 which are pivoted to the base 26 by a pin 28. The clamping jaws 27 are urged into clamping relation with a grooved trolley wire 29 by a nut 30 which has a downward projecting flange 31 serving to engage the clamping jaws 27 and swing them toward each other when the nut 30 is screwed downward.

After the insulators have been mounted, the upper cable clamping member 16, 18, with the nut 17 in place, is screwed in place The procedure in stringing the cables will be obvious to those skilled in the art and need not be described. I wish to point out, however, that after the twocables are in place it is feasible to release the feeder cable 24 without detaching the clamp from the trolley Wire 29,and feasible to release the trolley wire 29 Without disturbing feeder cable 24 at all. The possibility of'releasing the cable and the trolley wiresingly is quite important in maintenance work, and this possibility is a definite improvement over those 'types of clamp which are so con structed as to release both wires simultaneously. i Y Y The construction is compact, there being the least practicable interval between the trolley wire and the feeder cable. No part of the hanger projects in such away as to be injured by the trolley pole if this runs 0H.

' .The feeder is electrically connected with the trolley wire at each point of support. Finally, the invention permits the user to avail of any preferred type of trolley wire clamp and any preferredtype of insulator, and yet support the feeder cable directly above the trolley wire with the closest practicable spacing, a point of the utmost im portance in mine workings. I

While the form illustrated and described in detail is the best now "known to me, it is obvious that minor variations of form may be made without sacrifice of theadvantages characteristic of my invention. Accordingly I do not limit myselfto the specific form shown exceptlto the extent specified in the claims.

' What is claimed is: t

1. A feeder cable support comprisingin combination 'a clamp including a pair of separable cable clamping members and upon a cable; and attaching means at opposite ends of said clamp, one adapted for connection with asupport and the other for connection with a trolley wire clamp.

2. A feeder cable support comprising in combination a pair. of inter-engaging longitudinally adjustable clamping members adapted to receive a cable between them; means for clamping said members together upon an interposed cable; and attaching means, one on each clamping member, one adapted for connection with a sup ortand the other for connectionwith a tro ley Wire clamp.

3. A feeder cable support comprising in combination a clamping member having a transverse cable receiving channel; a clamping member fitting in said channel to clamp a cable therein; a nutv swiveled: on oneof said clamping members and threaded-tothe other; and attaching means, one on each clamping member. I

4. A feeder cable support comprising in combination a clamping memberhaving a transverse cable receiving channel; a clamptaching threads on the respective members for the reception of supportingmeans and trolley wire clamping means.

5. The combnatlon with a trolley wire clampj'and a support therefor of an inter- 6.1The. combination w th a trolley wire clamp and 'a support therefor 'ofan interposed cable clamp comprising two inter- .engaging clamping members one connected with the support and the otherwith the trolley wire clamp, and a sleeve nut'swiveled on one of sald clamping members and in threaded engagement with the other.

. In'testimQny'whereOf I have signed my name to this specification. means for clamping said members together CURTIS E. ROGERS.

ting member fitting in said channel to clamp posedseparablecable-clamp serving as a V prolongationof said support, 

